Loctite 22221 Threadlocker 222MS, Purple, 10mL Volume

Good for keeping screws in and nuts on bolts. Put it on the threads of the screw and wait the full 24 hours to be sure it's set. Been using their stuff for many years. Make sure you get the right strength for the size of your screws. - Low strength (this item) - purple/loctite 222 (liquid) is for up to 1/4" screws Med strength - blue/loctite 243 (liquid) & 248 (stick) is for 1/4" to 3/4" screws High strength - red/loctite 263 (liquid) is for up to 1" screws Purple you can take the screw back out with just a hand tool. Blue you may need some sort of leverage. Red you'll want to heat up a little bit before trying to remove the screw. Stay within the manufacturer's suggested strength for your screw size to avoid risking stripping/damage. I've stripped a few screws in the past thinking that it would be fine, but the screws were softer than I expected. Not worth the risk/headache. Using one too weak and you'll risk it not holding well enough.

Have only used to secure 1 optic at this time. So far, so good.

Loctite is a well known solution to keep screws from coming loose. There are different strengths (and other variants) to provide the right variety for the application needs. This purple variety is a low strength threadlock. Works well for something you may want to unscrew again without worrying about stripping the head, especially head types that cam out more easily. Yet it secure enough to give you confidence that they won't come loose from light use (carry / vibration). Easy to apply, easy to cleanup.

This is for very small screws. It's just to keep things from coming disassembled. If you need small screws to be held in place under heavy vibration or stress, I'd suggest the Loctite Blue 242 instead.

Loctite 222MS is the product to use on the use on the little screws that keep falling out from the bottom of computers, like Apple MacBook Pros. I ordered this after talking to a Loctite application specialist about which of their gazillion products was best for this application. He said that the 222MS (says the MS suffix matters) is the best product for small screws, that you might still want to remove for service. He says that the standard Loctite products are more suited to much larger screws, such as automotive applications.

This is my go to picture! I have white green blue and red also. This is almost all I use. It provides plenty of strength I have never had a bolt loosen. They break free much easier. For anything that is more permanent green is very strong and wicks. Red I never ever use unless it is something that will never ever be unbolted! Purple is the best. Really when a bolt is properly torqued it almost always stays there. So a little bit of the low strength purple is plenty of power.

Nothing much to say about this, it is Loctite, so a brief of what I use it for: I use the Purple 222MS to secure grip screws, sight set screws and those few Harley bolts that I remove often. The purple holds against vibration, but is easy to break loose with a little torque. I use the 243 blue to secure bolts on my Harley that I may need/want to remove later, and to secure grip nuts on my pistols. These are not things that I plan to remove anytime soon, and want to make sure they stay put until I may need to remove them. When I need to make sure something does not move at all, I use Loctite Red 262. This takes a lot of torque and heat to remove. Do NOT use this until you know how strong it is and you know how to remove it. Do NOT use this on any screw you want to remove.

Well worth it for my project. I want to do it once and the right way. Very expensive but you only need a little bit. So a small bottle should last me my lifetime.

This is a very hard to aquire product. Everyone and every place has red and blue. But the green (used on already assembled fasteners) and purple (low strength- for very small screws ie:glasses) are hard to find. Luckily Amazon made it possible. Works as I need, keeps small screws in place on electronics and works well on my glasses.

Use this on most of the bolts on my bicycles as well as threaded bottom brackets. No need for the stronger “blue” threadlocker, the 222 has never let me down. And it’s easy to remove the bolts, no heat or other tricks required.

It arrived from India. Took forever to get here. Had only 3 months till it outdated. A waste of money